A double-filter-structure based COMPASS/INS deep integrated navigation system implementation and tracking performance evaluation

Beidou or COMPASS is a Chinese GNSS(global navigation satellite system).Like the GPS receiver,the COMPASS receiver also faces the challenge of choosing an optimal bandwidth to satisfy both anti-jamming capability and dynamics adaptation simultaneously.GPS/INS(inertial navigation system)deep integrated navigation system has solved this problem by fusing GPS baseband signal and INS information in a deeply coupled mode.In this study,a COMPASS B3 frequency is considered and a traditional federated GPS/INS deep integration model is used to derive a single-filter-structure based COMPASS/INS deep integration model.Besides,a double-filter-structure based COMPASS/INS deep integration model is proposed.The simulation results show a better carrier tracking performance,especially a better dynamics adaptation.The impact of IMU errors and vehicle’s dynamics on carrier tracking performance of the double-filter-structure based COMPASS/INS deep integrated navigation system are evaluated in simulated and field environments.Simulation and field test results are in accordance with the theory analysis.     

An algorithm for function restoration using eigenvectors†

This paper presents an algorithm for the restoration of the characteristics of a function from a finite number of observed points. The algorithm uses the eigenvectors of the Gramian of the observed vectors and is based on the assumption that the function to be constructed can be represented by a specified form. Convergence of the algorithm is proved for the noiseless case. When noise is present, a bound for the error is obtained. For functions not representable in the assumed form, the algorithm can be used to test the non-representability of the function. A numerical example is given to illustrate the theoretical investigation.     

A note on the potential function algorithm for pattern classification†

A system design engineer often resorts to redundancies while maximizing the probability of success of a system designed to perform a certain job over a period, This will have to be done within the resources available. The problem of maximizing system reliability, subject to some linear constraints such as cost, weight or volume, is considered in this paper- The usual problem is transformed to a suitable form and the least square concept is used to develop a solution technique. This type of approach is found to be very simple and faster than earlier methods although the solution is an approximate one.     

An algorithm for the improvement of linear separation†

A method is presented for the improvement of linear separation. The characteristic vector is modified using the required distance of the boundary from the nearest pattern. Using this modified characteristic vector the weight vector is adjusted.     

Synthesis and characterization of Ba2−xSrxEuSbO6 ceramic substrates for YBCO films

A group of complex perovskites, Ba2−xSrxEuSbO6 (where x=0, 1 and 2) was synthesized and sintered as single-phase materials for their use as substrates for YBCO superconductor films. These compounds have a complex cubic perovskite (A2BB′O6) crystal structure with lattice constant in the range 0.85–0.83 nm. The values of dielectric constant and loss factor of Ba2−xSrxEuSbO6 compounds are in the range suitable for their use as substrates for microwave applications of superconductor films. The dielectric constant decreases with increase of strontium content. No chemical reaction was observed between YBCO and Ba2−xSrxEuSbO6 ceramics even when they were mixed in composites of the form 80 vol% YBCO–20 vol% Ba2−xSrxEuSbO6 and processed under severe heat treatment. Addition of up to 20 vol% Ba2−xSrxEuSbO6 to YBCO showed no detrimental effect on superconducting properties of YBCO. The YBCO thick films developed on sintered specimens by dip coating were textured and showed (0 0 l) orientation with Tc(0)=92 K. This revised version was published online in November 2006 with corrections to the Cover Date.     

MODELING the POWER CONSUMPTION DURING SHEETING of DOUGHS FOR TRADITIONAL INDIAN FOODS

The model given by Levine has been extended to account for the effects of moisture, salt and fat through appropriate modifications based on theory and computational experience. Appropriate modifications to consistency index and flow behavior index as a function of moisture, salt and fat are given. the thickness of sheeted dough has been modeled as a function of gap, reduction ratio and the flow behavior index which constitutes an important contribution. the model so modified was fitted to experimental data on power consumption in sheeting dough prepared from two flour types, viz., whole wheat flour and resultant atta, respectively, at five combinations of gap and reduction ratios and three levels each of moisture, salt and fat (conforming to actual use ranges) using Nelder-Mead algorithm for nonlinear optimization. These models provided 12 constants for each flour type which gave fundamental information on the dough properties for each flour type. Three-dimensional graphics have been used to interpret the model. These models appear to be of much practical use.     

Room-temperature ferromagnetic and photoluminescence properties of indium–tin-oxide nanoparticles synthesized by solid-state reaction

In the present study, indium–tin-oxide (ITO) nanoparticles were synthesized using solid-state reaction and studied for their structural, vibrational and magnetic properties. The ITO nanoparticles were prepared under reduced pressure, which can increase the oxygen vacancies in the samples. The X-ray diffraction studies confirmed singe-phase cubic bixbyite structure of ITO with average crystallite size of 47 nm. The lattice vibrational studies (FT-IR and Raman spectroscopy) at room temperature indicated that Sn ions were occupied in In₂O₃ lattice and gives corresponding active vibrational modes in the respective spectra. The magnetic studies at room temperature reveal the ferromagnetic nature of ITO and the strength of magnetization is superior to those of In₂O₃ and SnO₂. However, the magnetic studies at 100 K revealed reduced ferromagnetism, which could be attributed to reduced itinerary electrons at low temperature. Blue and blue–green emissions were found from the ITO nanoparticles, which could be due to vacancies or surface defects present in the system.     

Theoretical prediction and validation of global horizontal solar irradiance for a tropical climate in India

This paper aims to propose monthly models responsible for the theoretical evaluation of the global horizontal irradiance of a tropical region in India which is Sivagangai situated in Tamilnadu. The actual measured global horizontal irradiance hails from a 5 MW solar power plant station located at Sivagangai in Tamilnadu. The data were monitored from May 2011 to April 2013. The theoretical assessment was conducted differently by employing a programming platform called Microsoft Visual Basic 2010 Express. A graphical user interface was created using Visual Basic 2010 Express, which provided the evaluation of empirical parameters for model formulation such as daily sunshine duration (S), maximum possible sunshine hour duration (S₀), extra terrestrial horizontal global irradiance (H₀) and extra terrestrial direct normal irradiance (G₀). The proposed regression models were validated by the significance of statistical indicators such as mean bias error, root mean square error and mean percentage error from the predicted and the actual values for the region considered. Comparison was made between the proposed monthly models and the existing normalized models for global horizontal irradiance evaluation.